Explore four private gardens in Houston, open for self-guided tours to benefit the Garden Conservancy and Peckerwood Garden. Peckerwood will be hosting a plant sale on the Open Day at 10037 Hazelhurst Drive. Highlights include a 12, 000-gallon pond with lilies and koi, a pollarded sycamore allée, hundreds of camellias and azaleas, including a heart-shaped azalea parterre, and both traditional and contemporary designs. No reservations required; rain or shine. For More Information: See www.opendaysprogram.org or call The Garden Conservancy toll-free weekdays, 9 a.m. to 5 p.m. EST, 1-888-842-2442.